Issue |
A&A
Volume 695, March 2025
|
|
---|---|---|
Article Number | A74 | |
Number of page(s) | 20 | |
Section | Planets, planetary systems, and small bodies | |
DOI | https://doi.org/10.1051/0004-6361/202453011 | |
Published online | 11 March 2025 |
A novel method for estimating the far-ultraviolet flux, and a catalogue for disc-hosting stars in nearby star-forming regions
1
Dipartimento di Fisica, Università degli Studi di Milano,
Via Celoria 16,
20133
Milano, Italy
2
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange,
06300
Nice, France
3
European Southern Observatory,
Karl-Schwarzschild-Str. 2,
85748
Garching bei München, Germany
4
Dipartimento di Fisica e Astronomia, Università di Firenze,
Via G. Sansone 1,
50019,
Sesto F.no (Firenze), Italy
5
Department of Astrophysics, University of Vienna,
Türkenschanzstrasse 17,
1180
Vienna, Austria
6
Dipartimento di Fisica e Astronomia, Università di Bologna, Via Gobetti 93/2, 40122, Bologna, Italy; INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5,
50125
Firenze,
Italy
★ Corresponding author; rossella.anania@unimi.it
Received:
15
November
2024
Accepted:
27
January
2025
When protoplanetary discs are externally irradiated by far-ultraviolet (FUV) photons from OBA-type stars, they lose material through photoevaporative winds. This reduces the amount of material that is available to form planets. Understanding the link between the environmental irradiation and the observed disc properties requires accurately evaluating the FUV flux at disc-hosting stars, which can be challenging because of the uncertainty in stellar parallax. We addressed this issue by proposing a novel approach: using the local density distribution of a star-forming region (i.e. 2D pairwise star separation distribution) and assuming isotropy, we inferred the 3D separation between disc-hosting stars and massive stars. We tested this approach on synthetic clusters and showed that it significantly improves accuracy compared to previous methods. We computed the FUV fluxes for numerous star-bearing discs in seven regions within ~200 pc, six regions in Orion and in Serpens sub-regions. We provided a publicly accessible catalogue. We found that discs in regions hosting late-type B and early-type A stars can reach non-negligible FUV radiation levels for the disc evolution (10–100 G0). We investigated dust disc masses relative to FUV fluxes and detected indications of a negative correlation when we restricted the investigation to average region ages. However, we emphasize the need for more stellar and disc measurements at >102 G0 to probe the dependence of disc properties on environmental irradiation. The method presented in this work is a powerful tool that can be expanded to additional regions.
Key words: accretion, accretion disks / catalogs / protoplanetary disks / stars: distances / stars: protostars
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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